Method and apparatus for adding/droping optical signals in a semiconductor substrate

Inactive Publication Date: 2005-02-15
INTEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Integrating the circulators with the fiber Bragg gratings is a challenge for this approach.
A limitation with current fiber Bragg gratings is that the particular wavelength reflected by the fiber Bragg grating is substantially fixed.
The disadvantages of this technique are that the tuning range to the reflected wavelength is relatively small and the optical fiber may suffer damage from stress and strain induced by the physical stretching.

Method used

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  • Method and apparatus for adding/droping optical signals in a semiconductor substrate
  • Method and apparatus for adding/droping optical signals in a semiconductor substrate
  • Method and apparatus for adding/droping optical signals in a semiconductor substrate

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Embodiment Construction

Methods and apparatuses for adding and dropping DWDM channels of an optical signal traveling through a semiconductor substrate are disclosed. In the following description numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one having ordinary skill in the art that the specific details need not be employed to practice the present invention. In other instances, well-known materials or methods have not been described in detail in order to avoid obscuring the present invention.

Reference throughout this specification to “one embodiment” or “an embodiment” means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. Thus, appearances of the phrases “in one embodiment” or “in an embodiment” in various places throughout this specification are not necessarily all referring to the same embodimen...

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Abstract

A semiconductor-based tunable add / drop method and apparatus. In one aspect of the present invention, a method according to an embodiment of the present invention includes splitting a first optical beam having multiple wavelengths into second and third optical beams with a first 3 dB optical coupler disposed in a semiconductor substrate. Portions of the second and third optical beams having a tunable wavelength are reflected back to the first 3 dB optical coupler with first and second pluralities of silicon and polysilicon interfaces, respectively, disposed along the semiconductor substrate. In another embodiment, the portions of the second and third optical beams having a tunable wavelength are reflected back to the first 3 dB optical coupler with first and second pluralities of modulated charged regions. Portions of the second and third optical beams not reflected are directed to a second 3 dB optical coupler disposed in the semiconductor substrate. The portions of the second and third optical beams not reflected are combined into a fourth optical beam with the second 3 dB optical coupler.

Description

BACKGROUND OF THE INVENTION1. Field of the InventionThe present invention relates generally to optical devices and, more specifically, the present invention relates to optical add / drop devices.2. Background InformationThe need for fast and efficient optical-based technologies is increasing as the growth rate of Internet data traffic overtakes that of voice traffic, pushing the need for fiber optic communications. Transmission of multiple optical channels over the same fiber in the dense wavelength-division multiplexing (DWDM) system provides a simple way to use the unprecedented capacity (signal bandwidth) offered by fiber optics. Commonly used optical components in the system include WDM transmitters and receivers, optical add / drop multiplexers, and optical filters such as diffraction gratings, thin-film filters, fiber Bragg gratings, and arrayed-waveguide gratings.Optical add / drop multiplexers are used in optical telecommunications and networking industries to add new channels and...

Claims

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Application Information

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IPC IPC(8): G02B6/124G02B6/12G02F1/01G02F1/025
CPCG02B6/124G02F1/025G02B2006/12097G02F2201/307G02F1/0147G02B2006/12135
InventorLIU, ANSHENGPANICCIA, MARIO J.NICOLAESCU, REMUSALDUINO, ANDREW C.LIAO, LING
OwnerINTEL CORP